Correlation between the endocrine profile of ovulation and the ultrasonically detected 'double contour' of the preovulatory follicle.

The exact prediction of ovulation is becoming more important in the management of infertile couples. The routine methods used to monitor ovulation are plasma levels of estradiol and luteinizing hormone, and ultrasonic scanning of graafian follicle diameter. Ovulation is known to occur at a wide range of follicular diameters and it cannot be used as a single predictor of ovulation. In a previous study we described the preovulatory double contour of the dominant follicle occurring a few hours before ovulation. The purpose of this study was to correlate this sign with the hormonal profile to determine whether it can be used as a single parameter in predicting ovulation. The results demonstrate a close relationship between the LH peak and the appearance of the double contour which can be used as a reliable predictor of impending ovulation.